Magnetic contact switch (door sensor)
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This sensor is essentially a reed switch, encased in an ABS plastic shell. Normally the reed is 'open' (no connection between the two wires). The other half is a magnet. When the magnet is less than 13mm (0.5") away, the reed switch closes. They're often used to detect when a door or drawer is open, which is why they have mounting tabs and screws. You can also pick up some double-sided foam tape from a hardware store to mount these, that works well without needing screws.
Revision History: As of June 2, 2021, we now have these with premium wire ends for easy breadboarding.
- Normally open reed switch
- ABS enclosure
- Rated current: 100 mA max
- Rated voltage: 200 VDC max
- Distance: 15mm max
- Box size (each side): 29mm x 15.2mm x 9mm
- Cable Length: ~29cm / ~11.4"
Mouser ElectronicsUnited States
NTREX, Inc.- DevicemartSouth Korea
Digi-Key ElectronicsUnited States
Cool ComponentsUnited Kingdom
See our Distributors page for a complete list of distributors.